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Originally Posted by JCL
The single most common cause of the SES light is the gas cap being loose. It can be cross-threaded, or just not tight, and if it doesn't seal there is a fault due to the evaporative emissions system controls sensing a leak. Any chance the vehicle was refueled the day the light came on, or the day prior?
Check the gas cap, tighten it up, and see if the code goes away within a day. It won't go out immediately, but it will self-reset. If not, book it at the dealer.
If it isn't the gas cap, it is more likely to be a sensor than anything internal in the engine.
Good luck.
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HMMM.... now there is a "check gas cap" light so the SES doesn't come on when the cap is not on.
On my 06 the cap was bad and that light was on all the time. I took that thing to the deal at least 20 time and each time I told them "I think the cap is bad" and each time all they said was "can't duplicate the problem".
The car was under warranty and they wouldn't give me a new cap no matter what I said.
Finally I wrote a letter to BMW and within a few days the dealer called to ask me to bring the car in. I told them the "I think the cap is bad" they gave me a new one off I went and off went the light forever.